ISO 9022-4:2014规定了与光学仪器（包括其他领域的附加组件（如机械、化学和电子设备））在同等条件下的环境试验相关的方法，以确定其抵抗盐雾影响的能力。 暴露在盐雾中主要导致金属腐蚀。影响也可能通过堵塞或捆绑运动部件的方式发生。 测试的目的是尽早评估仪器，尤其是仪器表面和保护涂层抵抗盐环境影响的能力。 通常，使用代表性样品或完整的小型单元进行测试。只有在特殊情况下，才能按照ISO 9022本部分的规定对完整的大型仪器或组件进行测试。

ISO 9022-4:2014 specifies the methods relating to the environmental tests of optical instruments including additional assemblies from other fields (e.g. mechanical, chemical, and electronic devices), under equivalent conditions, for their ability to resist the influence of salt mist. Exposure to salt mist mainly results in the corrosion of metals. Effects might also occur by way of clogging or binding of moving parts. The purpose of the testing is to assess, as early as possible, the ability of the instrument, and particularly of the surfaces and protective coatings of the instrument, to resist the effects of a salt atmosphere. Normally, representative samples or complete small units are used for testing. Complete large instruments or assemblies are only tested as specified in this part of ISO 9022 in exceptional cases.